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* Eclipsys Corp., a maker of health-care information software, said it made an unsolicited offer to acquire rival Shared Medical Systems Corp. for $2 billion in stock and cash. Delray Beach, Fla.-based Eclipsys said the deal would value Malvern, Pa.-based Shared Medical Systems at about $67 a share. Shared Medical closed at $38.25, down $1.19, on the New York Stock Exchange. Eclipsys rose $3.06 to close at $28.63 on Nasdaq. Shared Medical was not available for comment.

* Silicon Graphics Inc. reached an agreement to sell its Cray supercomputer unit to scientific-computer maker Tera Computer Co. for an undisclosed amount. Tera said the combined business, to be called Cray Inc., will have more than $200 million in annual revenue and about 900 employees, almost 90% of them from Cray. Silicon Graphics in August said it planned to sell Cray. Mountain View, Calif.-based Silicon Graphics fell 25 cents to close at $9.88 on the New York Stock Exchange. Seattle-based Tera fell $1.13 to close at $9.88 on Nasdaq.